When loading a tanker, you should perform which of the following functions to ensure a safe operation?

Correct Answer: Option C — close valves by closing them down, reopening one or two turns, and re-closing

Closing a valve by seating it, backing off slightly, and re-seating ensures the valve is fully closed and prevents thermal expansion or pressure surges from jamming the mechanism. This standard operating procedure protects the valve seat and ensures a positive, leak-free seal during critical cargo transfer operations.